/indra/llui/llundo.h
C++ Header | 68 lines | 35 code | 8 blank | 25 comment | 2 complexity | 7bac9818b1d02361e204e4a069bc7fd6 MD5 | raw file
Possible License(s): LGPL-2.1
- /**
- * @file llundo.h
- * @brief Generic interface for undo/redo circular buffer.
- *
- * $LicenseInfo:firstyear=2000&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
- #ifndef LL_LLUNDO_H
- #define LL_LLUNDO_H
- class LLUndoBuffer
- {
- public:
- class LLUndoAction
- {
- friend class LLUndoBuffer;
- public:
- virtual void undo() = 0;
- virtual void redo() = 0;
- virtual void cleanup() {};
- protected:
- LLUndoAction(): mClusterID(0) {};
- virtual ~LLUndoAction(){};
- private:
- S32 mClusterID;
- };
- LLUndoBuffer( LLUndoAction (*create_func()), S32 initial_count );
- virtual ~LLUndoBuffer();
- LLUndoAction *getNextAction(BOOL setClusterBegin = TRUE);
- BOOL undoAction();
- BOOL redoAction();
- BOOL canUndo() { return (mNextAction != mFirstAction); }
- BOOL canRedo() { return (mNextAction != mLastAction); }
- void flushActions();
- private:
- LLUndoAction **mActions; // array of pointers to undoactions
- S32 mNumActions; // total number of actions in ring buffer
- S32 mNextAction; // next action to perform undo/redo on
- S32 mLastAction; // last action actually added to undo buffer
- S32 mFirstAction; // beginning of ring buffer (don't undo any further)
- S32 mOperationID; // current operation id, for undoing and redoing in clusters
- };
- #endif //LL_LLUNDO_H